switch (uarch) { case cpuinfo_uarch_cortex_a5: /* * Cortex-A5 Technical Reference Manual: * 6.3.1. Micro TLB * The first level of caching for the page table information * is a micro TLB of 10 entries that is implemented on each of * the instruction and data sides. 6.3.2. Main TLB Misses from * the instruction and data micro TLBs are handled by a unified * main TLB. The main TLB is 128-entry two-way set-associative. */ break; case cpuinfo_uarch_cortex_a7: /* * Cortex-A7 MPCore Technical Reference Manual: * 5.3.1. Micro TLB * The first level of caching for the page table information * is a micro TLB of 10 entries that is implemented on each of * the instruction and data sides. 5.3.2. Main TLB Misses from * the micro TLBs are handled by a unified main TLB. This is a * 256-entry 2-way set-associative structure. The main TLB * supports all the VMSAv7 page sizes of 4KB, 64KB, 1MB and 16MB * in addition to the LPAE page sizes of 2MB and 1G. */ break; case cpuinfo_uarch_cortex_a8: /* * Cortex-A8 Technical Reference Manual: * 6.1. About the MMU * The MMU features include the following: * - separate, fully-associative, 32-entry data and * instruction TLBs * - TLB entries that support 4KB, 64KB, 1MB, and 16MB pages */ break; case cpuinfo_uarch_cortex_a9: /* * ARM Cortex‑A9 Technical Reference Manual: * 6.2.1 Micro TLB * The first level of caching for the page table information * is a micro TLB of 32 entries on the data side, and * configurable 32 or 64 entries on the instruction side. 6.2.2 * Main TLB The main TLB is implemented as a combination of: * - A fully-associative, lockable array of four elements. * - A 2-way associative structure of 2x32, 2x64, 2x128 or * 2x256 entries. */ break; case cpuinfo_uarch_cortex_a15: /* * ARM Cortex-A15 MPCore Processor Technical Reference Manual: * 5.2.1. L1 instruction TLB * The L1 instruction TLB is a 32-entry fully-associative * structure. This TLB caches entries at the 4KB granularity of * Virtual Address (VA) to Physical Address (PA) mapping only. * If the page tables map the memory region to a larger * granularity than 4K, it only allocates one mapping for the * particular 4K region to which the current access * corresponds. 5.2.2. L1 data TLB There are two separate * 32-entry fully-associative TLBs that are used for data loads * and stores, respectively. Similar to the L1 instruction TLB, * both of these cache entries at the 4KB granularity of VA to * PA mappings only. At implementation time, the Cortex-A15 * MPCore processor can be configured with the -l1tlb_1m option, * to have the L1 data TLB cache entries at both the 4KB and 1MB * granularity. With this configuration, any translation that * results in a 1MB or larger page is cached in the L1 data TLB * as a 1MB entry. Any translation that results in a page * smaller than 1MB is cached in the L1 data TLB as a 4KB entry. * By default, all translations are cached in the L1 data TLB as * a 4KB entry. 5.2.3. L2 TLB Misses from the L1 instruction and * data TLBs are handled by a unified L2 TLB. This is a * 512-entry 4-way set-associative structure. The L2 TLB * supports all the VMSAv7 page sizes of 4K, 64K, 1MB and 16MB * in addition to the LPAE page sizes of 2MB and 1GB. */ break; case cpuinfo_uarch_cortex_a17: /* * ARM Cortex-A17 MPCore Processor Technical Reference Manual: * 5.2.1. Instruction micro TLB * The instruction micro TLB is implemented as a 32, 48 or 64 * entry, fully-associative structure. This TLB caches entries * at the 4KB and 1MB granularity of Virtual Address (VA) to * Physical Address (PA) mapping only. If the translation tables * map the memory region to a larger granularity than 4KB or * 1MB, it only allocates one mapping for the particular 4KB * region to which the current access corresponds. 5.2.2. Data * micro TLB The data micro TLB is a 32 entry fully-associative * TLB that is used for data loads and stores. The cache entries * have a 4KB and 1MB granularity of VA to PA mappings * only. 5.2.3. Unified main TLB Misses from the instruction and * data micro TLBs are handled by a unified main TLB. This is a * 1024 entry 4-way set-associative structure. The main TLB * supports all the VMSAv7 page sizes of 4K, 64K, 1MB and 16MB * in addition to the LPAE page sizes of 2MB and 1GB. */ break; case cpuinfo_uarch_cortex_a35: /* * ARM Cortex‑A35 Processor Technical Reference Manual: * A6.2 TLB Organization * Micro TLB * The first level of caching for the translation table * information is a micro TLB of ten entries that is implemented * on each of the instruction and data sides. Main TLB A unified * main TLB handles misses from the micro TLBs. It has a * 512-entry, 2-way, set-associative structure and supports all * VMSAv8 block sizes, except 1GB. If it fetches a 1GB block, * the TLB splits it into 512MB blocks and stores the * appropriate block for the lookup. */ break; case cpuinfo_uarch_cortex_a53: /* * ARM Cortex-A53 MPCore Processor Technical Reference Manual: * 5.2.1. Micro TLB * The first level of caching for the translation table * information is a micro TLB of ten entries that is implemented * on each of the instruction and data sides. 5.2.2. Main TLB A * unified main TLB handles misses from the micro TLBs. This is * a 512-entry, 4-way, set-associative structure. The main TLB * supports all VMSAv8 block sizes, except 1GB. If a 1GB block * is fetched, it is split into 512MB blocks and the appropriate * block for the lookup stored. */ break; case cpuinfo_uarch_cortex_a57: /* * ARM® Cortex-A57 MPCore Processor Technical Reference Manual: * 5.2.1 L1 instruction TLB * The L1 instruction TLB is a 48-entry fully-associative * structure. This TLB caches entries of three different page * sizes, natively 4KB, 64KB, and 1MB, of VA to PA mappings. If * the page tables map the memory region to a larger granularity * than 1MB, it only allocates one mapping for the particular * 1MB region to which the current access corresponds. 5.2.2 L1 * data TLB The L1 data TLB is a 32-entry fully-associative TLB * that is used for data loads and stores. This TLB caches * entries of three different page sizes, natively 4KB, 64KB, * and 1MB, of VA to PA mappings. 5.2.3 L2 TLB Misses from the * L1 instruction and data TLBs are handled by a unified L2 TLB. * This is a 1024-entry 4-way set-associative structure. The L2 * TLB supports the page sizes of 4K, 64K, 1MB and 16MB. It also * supports page sizes of 2MB and 1GB for the long descriptor * format translation in AArch32 state and in AArch64 state when * using the 4KB translation granule. In addition, the L2 TLB * supports the 512MB page map size defined for the AArch64 * translations that use a 64KB translation granule. */ break; }